At the very time that some in the United States have timidly embraced multiracialism as a fitting ideal for North Americans, Latin American critics have begun to argue that multiracialism, like racial democracy, functions as an ideology that masks enduring racial injustice and thus blocks substantial political, social, and economic reform.

As scientists explore the human genome and medicines tailored to particular genes, a provocative question emerges about whether there is a genetic marker that could explain why some treatments work better for different racial groups. And some say the narrow focus on race misses the point of social disparities and what we now know about genetics. (00:54:12)

(Interview suspends at 00:26:40 for a short news update, then restarts at 00:30:23.)